Gasoline is free of lead, which caused its share of sludge. In the old days, engine oil technology wasn’t as refined either, cooking onto hot surfaces and lumping into one hot mess for rebuilders.

After prolonged exposure to high heat, engine oil can oxidize and break down, forming deposits known as sludge. This gelatinous goo can block vital oil passages, resulting in thousands of dollars ...

And, yes, you do see oil stains under the Z28 that were scrubbed from the cement. Engine oil sludge builds up everywhere, including inside rear main seals, and leads to plugged oil galleys and ...

The video opens with the on-screen caption: “Engine sludge is a serious problem nowadays! Should we be shortening the oil change intervals?!” Cooke Jr. stands next to the engine of the 2018 ...

DETROIT - In the latest example of Volkswagen of America Inc.'s quality woes, the automaker is warning 426,000 VW Passat and Audi A4 owners of an engine oil sludge problem. Affected are 1.8-liter ...

The threat is the buildup of sludge -- gooey tarlike deposits -- that reduces or shuts off oil circulation and can mean thousands of dollars to repair or replace an engine that has seized.

like leaky seals or a buildup of engine sludge. That's where high mileage oil comes into play. These oils are designed specifically to combat those problems and contain special ingredients like ...

Moreover, good engine oil removes dirt and other debris from the byproducts of combustion while preventing sludge. Engine sludge is a thick, gooey gel-like substance that forms when oil becomes ...

This is a natural process of water condensation on the metallic parts of the engine. Water mixed with oil creates a yellow “sludge” resembling butter or mayonnaise, negatively affecting the ...